| Company | Location | Certifications | License # |
|---|---|---|---|
| A3 Underground | Cambridge, ID | Installer | — |
| Advanced Terrain Design | Weiser, ID | Installer | — |
| Backhoe and Concrete Works, LLC. | Weiser, ID | Installer | — |
| DD Fairchild Excavation | Midvale, ID | Installer | — |
| Kim Braun Construction Services | Cambridge, ID | Installer | — |
| Upgrade Excavation, Inc. | Cambridge, ID | Installer | — |
6 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Washington County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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